swift - 委托(delegate)方法没有被调用？ (核心蓝牙)

Question

我正在 Swift 3 中使用 CoreBluetooth 来模拟带有 BTLE 的串行端口。该服务对中央设备可见，并且外围(快速)端的任何更新都会更新中央端，不会出现问题。

当我从中央端发送读取或写入请求时，peripheralManager() 委托(delegate)方法之一应该处理该事件；但是，无论发生什么情况，都不会调用任何委托(delegate)方法，并且中央设备最终会失去连接(我认为是由于超时)。

class BTConnectionHandler: NSObject, CBPeripheralManagerDelegate {

var cbManager: CBPeripheralManager!

var serialService: CBMutableService!
var tx: CBMutableCharacteristic!
var rx: CBMutableCharacteristic!

override init() {

    super.init()

    cbManager = CBPeripheralManager(delegate: self, queue: nil)
    cbManager.startAdvertising(ADVERTISEMENT_DATA)

    serialService = CBMutableService(type: SERIAL_UUID, primary: true)
    tx = CBMutableCharacteristic(type: TX_UUID, properties: TX_PROPERTIES, value: nil, permissions: TX_PERMISSIONS)
    rx = CBMutableCharacteristic(type: RX_UUID, properties: RX_PROPERTIES, value: nil, permissions: RX_PERMISSIONS)
    serialService.characteristics = [tx,rx]

    cbManager.add(serialService)

}

// PERIPHERAL (this) Write to TX
internal func write(string: String) -> Bool {
    let data = string.data(using: String.Encoding.utf8)!
    tx.value = data
    return cbManager.updateValue(data,for: tx,onSubscribedCentrals: nil)
}

// PERIPHERAL (this) Read from RX
internal func read() -> String? {
    if let outString = String(data: rx.value!, encoding: String.Encoding.utf8) {
        return outString
    } else {
        print("RX buffer is empty")
        return nil
    }
}

// CENTRAL read from TX
func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveRead request: CBATTRequest) {
    print("Read request received from central device")
    request.value = tx.value
    cbManager.respond(to: request, withResult: .success)
}

// CENTRAL write to RX
func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveWrite requests: [CBATTRequest]) {
    print("Write request(s) received from central device")
    for request in requests {
        rx.value = request.value
        cbManager.respond(to: request, withResult: .success)
    }
}

// Print state of peripheral manager as it changes
func peripheralManagerDidUpdateState(_ peripheral:CBPeripheralManager) {

   print(peripheral.state)

}


}

Answer 1

我遇到了类似的问题，让我困惑了几个小时。我的问题是属性。一旦我添加了 .read 属性，didReceiveRead 回调就会被调用:

myCharacteristic = CBMutableCharacteristic(
    type: myUUID,
    properties: [CBCharacteristicProperties.notify, CBCharacteristicProperties.read], //*** Need Read Permission to READ!!
    value: nil,
    permissions: CBAttributePermissions.readEncryptionRequired
)